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Single-Phase Transformer Winding Resistance Meters

RMO-TW Series

IBEKO Power AB

RMO-TW Series - IBEKO Power AB

RMO-TW series is perfect for winding resistance measurements of inductive objects. It is ideal for testing transformer windings (power transformers, distribution, autotransformers) and for on-load tap changer verification. In addition, any RMO-TW transformer ohmmeter & tap changer analyzer can also perform transformer demagnetization.The series contains 4 models, with maximal test currents from 10 A (RMO10TW) to 50 A (RMO50TW). They are fitted in a portable and lightweight metal housing.All ...
RMO-TW series is perfect for winding resistance measurements of inductive objects. It is ideal for testing transformer windings (power transformers, distribution, autotransformers) and for on-load tap changer verification. In addition, any RMO-TW transformer ohmmeter & tap changer analyzer can also perform transformer demagnetization.The series contains 4 models, with maximal test currents from 10 A (RMO10TW) to 50 A (RMO50TW). They are fitted in a portable and lightweight metal housing.All transformer ohmmeters from RMO-TW series generate a true DC ripple-free current with automatically regulated measurement and discharging circuit. The injection of current and discharge of energy from the test object are automatically regulated.Three independent channels enable testing of three windings in series. Consequently, this enables measurements of winding resistance in every tap position of an on-load tap changer without discharging between the tests.DV-Win software enables control and observation of the test process, as well as saving and analyzing the results on a PC. It provides a test report, arranged in a selectable form as an Excel spreadsheet, PDF, Word, or ASCII format. Additionally, DV-Win measures and calculates the OLTC transition time, the ripple and the winding resistance for each tap changing operation. The software can also perform the calculations necessary for the “Heat Run” test. Finally, a user can export all results in the form of a report.
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Electrical Measurement Equipment

EUROSMC, S.A.

EUROSMC, S.A.

Portable equipment designed for maintenance and commissioning of substations and power plants. Low resistance micro ohmmeters, digital timers, windings resistance, contact resistance, circuit breaker timing and motion, phase angle and frequency measurements.

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Motor Winding Ohmmeter

RMO-M Series

IBEKO Power AB

RMO-M Series - IBEKO Power AB

The motor/generator winding resistance test is used to identify open windings, shorts between two windings, short to grounds, connection mistakes or shorted turns. This non-invasive test of winding resistance helps to pinpoint problems regarding windings in stator or rotor part of an electrical machine. Additionally, motor winding ohmmeter has the capability of performing heat run test which will show a change in windings resistance with an increase of temperature.The RMO-M series is designed as...
The motor/generator winding resistance test is used to identify open windings, shorts between two windings, short to grounds, connection mistakes or shorted turns. This non-invasive test of winding resistance helps to pinpoint problems regarding windings in stator or rotor part of an electrical machine. Additionally, motor winding ohmmeter has the capability of performing heat run test which will show a change in windings resistance with an increase of temperature.The RMO-M series is designed as an ideal aid in preventive maintenance of electrical motors and generators. They are powerful (up to 100A of test current), portable (8 kg) and generate DC current which is completely ripple-free. This makes measurement very precise with 0,1% accuracy.Three voltage channels make measurement very easy since it is possible to obtain a value of all three winding resistances in one measurement
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10A DIGITAL MICRO-OHMMETER

MPK-2000e

MEGABRAS srl

MPK-2000e - MEGABRAS srl

The MPK-2000e digital very low resistance ohmmeter is a portable, microprocessor controlled instrument used to accurately measure resistances of switches and circuit breaker contacts, transformer and motor windings, wire and cable samples, joints in busbars, etc., using test currents from 1mA up to 10A. It uses the Kelvin-type, four-terminals measurement principle, thus eliminating errors caused by lead and contact resistances.

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10 A portable digital micro-ohmmeter

MPK-253

MEGABRAS srl

MPK-253 - MEGABRAS srl

The MPK-253 digital very low resistance ohmmeter is a portable, microprocessor-controlled instrument used to accurately measure resistances of switches and circuit breaker contacts, transformer and motor windings, wire and cable samples, joints in busbars, etc., using test currents from 1mA up to 10 A.

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Transformer Turns Ratio Testers

IBEKO Power AB

IBEKO Power AB

Transformer turns ratio testers from TRT series are DV Power instruments mainly designed for the measurement of power transformer turns ratio. Also, they measure transformer excitation current and phase shift. Special tests, such as automatic vector group detection and magnetic balance, can be performed on three-phase transformers and three-phase autotransformers.All models, except TRT03 series, have a built-in true three-phase power source, which is necessary for testing turns ratio of transfor...
Transformer turns ratio testers from TRT series are DV Power instruments mainly designed for the measurement of power transformer turns ratio. Also, they measure transformer excitation current and phase shift. Special tests, such as automatic vector group detection and magnetic balance, can be performed on three-phase transformers and three-phase autotransformers.All models, except TRT03 series, have a built-in true three-phase power source, which is necessary for testing turns ratio of transformers with special configurations, such as phase-shifting, rectifier, arc-furnace, traction transformers, etc.DV Power turns ratio testers can output various test voltages for different applications. From the extremely low test voltage of 1 V AC that enables turns ratio verification of the majority of current transformers, up to the highest test voltage of 500 V AC that provides the most accurate turns ratio testing of power transformers used in power generation and transmission. By using the external booster, test voltage increases up to 5 kV AC in order to successfully test capacitive voltage transformers.All DV Power turns ratio testers have a built-in tap changer control unit. Because of that, it is possible to control the on-load tap changer (OLTC) directly from the device. In order to make the most out of this feature, the instrument and included DV-Win software can be programmed to do everything automatically – running turns ratio tests, changing OLTC tap positions, and saving results. This option significantly facilitates and shortens the turns ratio testing time.TRT turns ratio testers use the same set of cables as three-phase winding ohmmeter & tap changer analyzers from the TWA series. Consequently, it enables one-time cable setup for performing eight tests:turns ratioexcitation currentphase anglemagnetic balancevector group detectionwinding resistanceon-load tap changer DVtestand demagnetization.
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Transformer Winding Ohmmeter

TWO-110S

VA Technology Co. Ltd.

TWO-110S - VA Technology Co. Ltd.

Transformer Winding Ohmmeter is designed to measure the dc resistance of all types of magnetic windings accurately. It can test transformers and rotating machine windings and perform low-current resistance measurement on connections, contacts and control circuits.

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1 A DIGITAL MILIOHMMETER

MO-2Ke

MEGABRAS srl

MO-2Ke - MEGABRAS srl

The MO-2Ke digital low resistance ohmmeter is a portable, microprocessor-controlled instrument used to accurately measure resistances of contacts, switches, transformer and motor windings, etc., using test currents from 1 mA up to 1 A.It uses the Kelvin-type (4-terminals) measurement principle, thus eliminating errors caused by lead and contact resistances.Resistance readings are shown in the alphanumeric display with up to a 4 digit-resolution. It allows to measure resistances of up to 2 kO, with resolution of 0.01 mO.Measurements accuracy is guaranteed by the state-of-the-art system for signal-amplification, offset-free and with long-term stability.

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Transformer Winding Resistance Meters

RMO TT Series

Amperis sl

RMO TT Series - Amperis sl

The Tap Changer Analyzer & Winding Ohmmeter of the RMO-TT series is designed for winding resistance measurement of inductive objects, and for a tap changer analysis. The RMO-TT series is based on the state of the art technology, using the most advanced switch mode technology available today. The RMO-TT instruments are accurate (0,1%), powerful (up to 100 A) and still portable. The Instruments generate a true DC ripple free current with automatically regulated measurement and discharging circ...
The Tap Changer Analyzer & Winding Ohmmeter of the RMO-TT series is designed for winding resistance measurement of inductive objects, and for a tap changer analysis. The RMO-TT series is based on the state of the art technology, using the most advanced switch mode technology available today. The RMO-TT instruments are accurate (0,1%), powerful (up to 100 A) and still portable. The Instruments generate a true DC ripple free current with automatically regulated measurement and discharging circuit. RMO-TT instruments can perform a simple, quick and reliable transformer on-load tap changer condition assessment. This series of instruments enable measurements of a winding resistance in every tap position, current ripple values (percentage of a current drop during a tap change) and transition times during the tap changes. Problems with a connection, contacts, and selector/diverter switch operation (tap change with interruption) can be detected with these measurements.
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Three-Phase Transformer Winding Resistance Meters

TWA Advanced Series

IBEKO Power AB

TWA Advanced Series - IBEKO Power AB

TWA Advanced series is the latest DV Power solution for three-phase transformer winding resistance measurement and tap changer analysis. They are capable of testing six transformer windings with a single cable connection, as well as three-phase automatic transformer demagnetization. It has the option of the automated test mode, where the instrument operates the tap changer without operator input (minimizing the risk of human error) and records winding resistance results based on pre-selected sta...
TWA Advanced series is the latest DV Power solution for three-phase transformer winding resistance measurement and tap changer analysis. They are capable of testing six transformer windings with a single cable connection, as well as three-phase automatic transformer demagnetization. It has the option of the automated test mode, where the instrument operates the tap changer without operator input (minimizing the risk of human error) and records winding resistance results based on pre-selected stabilization criteria.The unique DVtest method of tap changer analysis enables checking the moving contacts of on-load tap changers during the transition, measuring the transition time, detecting open circuits, and many other types of faults. It is performed with 0.1 ms sampling rate, together with the measurement of tap changer motor current which detects motor and mechanical issues. A special proprietary algorithm is used for testing tap changers connected through a built-in series (booster) transformer. The DVtest can be performed either on one phase or simultaneously on three phases. It can also be performed together with the winding resistance test in all tap positions.A unique advantage of TWA Advanced instruments is the capability of simultaneously testing the winding resistance of all three phases of a three-phase transformer connected in a YN configuration. This can significantly speed up the testing– for example, it enables the operator to perform 33 measurements instead of 99 on a tap changer with 33 tap positions.TWA500 is equipped with a large 10.1” graphical touch-screen display, while TWA400 has a 7” graphical touch-screen display. Besides making the interface much more user-friendly compared to older winding ohmmeters, it also enables certain test options that were previously available only with DV-Win software. The most important among them are DVtest, tap changer motor current measurement, “Heat Run” test, test templates, and automatic test mode.
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Motor/Generator Test Equipment

IBEKO Power AB

IBEKO Power AB

Winding ohmmeters RMO-M series measure winding resistance of inductive test objects such as electrical motors and generators. Motor test or generator test of winding resistance is especially important for early-stage failure detection.RMO-M series instruments generate true DC ripple-free current with automatically regulated measurement and discharge process. Even more, test instruments are portable and enclosed in a metal casing.Applications supported by DV Power motor/generator test equipment i...
Winding ohmmeters RMO-M series measure winding resistance of inductive test objects such as electrical motors and generators. Motor test or generator test of winding resistance is especially important for early-stage failure detection.RMO-M series instruments generate true DC ripple-free current with automatically regulated measurement and discharge process. Even more, test instruments are portable and enclosed in a metal casing.Applications supported by DV Power motor/generator test equipment include:Winding resistance measurement of generators and electrical motorsResistance measurement of high-current bus bar jointsResistance measurement of cable splicesAll of the above-mentioned measurements are performed with the highest accuracy. The advanced DV-Win PC software enables collecting both numerical and graphical results. These features provide an easier and more efficient analysis. After the test, a DV-Win software generates a test report a single click. Finally, a user can easily customize the report and save it in different formats, such as XLS and PDF.
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5 A portable digital micro-ohmmeter

MPK-254

MEGABRAS srl

MPK-254 - MEGABRAS srl

The MPK-254 digital very low resistance ohmmeter is a portable, microprocessor-controlled instrument used to accurately measure resistances of switches and circuit breaker contacts, transformer and motor windings, wire and cable samples, joints in busbars, etc., using test currents from 1 mA up to 5 A.

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Tap Changer Analyzers & Winding Ohmmeters

IBEKO Power AB

IBEKO Power AB

Winding resistance test of inductive test objects, such as power transformers, is one of the most effective non-intrusive ways of checking its condition. Due to their advanced design, DV Power winding resistance meters provide high test currents (up to 100 A DC) and high accuracy (up to 0.1%) within light and portable test instruments. In addition to winding resistance measurement, it is also possible to perform simple, quick and reliable transformer on-load tap changer condition assessment by r...
Winding resistance test of inductive test objects, such as power transformers, is one of the most effective non-intrusive ways of checking its condition. Due to their advanced design, DV Power winding resistance meters provide high test currents (up to 100 A DC) and high accuracy (up to 0.1%) within light and portable test instruments. In addition to winding resistance measurement, it is also possible to perform simple, quick and reliable transformer on-load tap changer condition assessment by recording the test current during tap changer operation, also known as DVtest. Because of that, problems with a tap changer connection, contacts, and switching procedure can be detected.DV Power winding ohmmeters consist of single-phase RMO-T and three-phase TWA series. Models from the TWA series are designed for six-winding resistance measurement of power and distribution transformers, with only one single-step cable setup. As a result of reducing the total test time, it enables significant saving of time and money.Typical application areas of these instruments are high-voltage substations and industrial environments. They are intended to measure the resistance of:Transformer windingsOn-load tap changersGeneratorsElectrical motorsHigh-current bus bar jointsCable splicesWelding joints
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Three-Phase Transformer Winding Resistance Meters

TWA Standard Series

IBEKO Power AB

TWA Standard Series - IBEKO Power AB

When it comes to winding resistance measurement on three-phase power transformers and autotransformers, TWA Standard series offers some of the most technically advanced instruments with LCD display in the market. Both models are capable of testing six transformer windings with a one-time cable connection, as well as three-phase automatic transformer demagnetization. The stored magnetic energy is safely automatically discharged at the end of the test. The built-in tap changer control unit enables...
When it comes to winding resistance measurement on three-phase power transformers and autotransformers, TWA Standard series offers some of the most technically advanced instruments with LCD display in the market. Both models are capable of testing six transformer windings with a one-time cable connection, as well as three-phase automatic transformer demagnetization. The stored magnetic energy is safely automatically discharged at the end of the test. The built-in tap changer control unit enables automated test mode, where the instrument operates the tap changer without operator input and records winding resistance results based on pre-selected stabilization criteria. This option makes the operator’s job significantly easier.Both models can output test currents from 5 mA to 25 A DC for the purpose of winding resistance measurement. TWA40D has a special test mode for checking the synchronization of on-load tap changers with three phases simultaneously tested in parallel, in which the total test current can rise to up to 40 A DC.TWA40D has additional advantages when it comes to non-intrusive tap changer analysis. The unique DVtest method enables checking the moving contacts of on-load tap changers during the transition, measuring the transition time, detecting open circuits, and many other types of faults. It is performed with 0.1 ms sampling rate, simultaneously with the measurement of tap changer motor current which helps with the detection of motor and mechanical issues. A special proprietary algorithm is used for testing tap changers connected through a built-in series (booster) transformer. The DVtest can be performed either on one phase or on three phases simultaneously. It can also be performed as an additional test simultaneously with the winding resistance test in all tap positions.An additional unique advantage of TWA40D is the capability of simultaneously testing the winding resistance of all three phases of a three-phase transformer (connected in a YN configuration). This can significantly shorten the total testing time – for example, it enables the operator to perform 33 measurements instead of 99 on a tap changer with 33 tap positions.The test leads for TWA three-phase transformer winding ohmmeters are interchangeable with the TRT turns ratio testers, which means that both sets of tests can be performed with a single test lead connection to the power transformer terminals.
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Ohmmeters

TEGAM Inc.

TEGAM Inc.

Ohmmeters by Tegam including milli-ohmmeters, microohmmeters, megohmmeters, 4-wire probes, and microohmmeters

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Ohmmeters

GAO Tek Inc.

GAO Tek Inc.

GAOTek provides state of the art, professional grade Ohmmeters for sale to the United States, Canada and Globally. GAOTek Ohmmeters are portable instruments that accurately measure electrical resistance between two points on a circuit. The Ohmmeters have their own power supply through their own battery, and are needed when the two probes (red: positive side of circuit, black: negative side of circuit) are connected to the two points in the circuit where the desired measurement is to take place. ...
GAOTek provides state of the art, professional grade Ohmmeters for sale to the United States, Canada and Globally. GAOTek Ohmmeters are portable instruments that accurately measure electrical resistance between two points on a circuit. The Ohmmeters have their own power supply through their own battery, and are needed when the two probes (red: positive side of circuit, black: negative side of circuit) are connected to the two points in the circuit where the desired measurement is to take place. The circuit is turned off, which is when the ohmmeter sends its own current through the circuit. Units of Ohms, symbolized by the Greek letter Ω (Omega), are used as a unit of measure when measuring electrical resistance. In accordance with Ohm’s law, when the current is passing through a circuit is at its maximum, the resistance is said to be the smallest.
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TERA Ohmmeter

Kleinwächter GmbH

Kleinwächter GmbH

Due to its compact design and battery operation, our TERA ohmmeters are ideally suited for mobile applications in industrial areas; They can also be in a stationary way through their mains connection. They are operated by only two buttons, are menu-driven and therefore very user-friendly. All settings are in the LCD display.

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Winding Resistance Test

20A DC booster

Doble Engineering

20A DC booster - Doble Engineering

The 20A DC STCS booster allows to perform resistance tests on a PT with a current up to 20 A DC. The option is used together with STS 5000 and STS 4000 and must be connected to STCS module.

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Winding Resistance Meter

Scope T&M Pvt, Ltd.

Scope T&M Pvt, Ltd.

Winding Resistance Meter

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OHMMETERS

DOT-1000-2

Criterion Instruments Limited

DOT-1000-2 - Criterion Instruments Limited

Model DOT-1000-2, is an ac four-terminal ohmmeter to be used for the measurement of dynamic ac resistance of batteries, fuel cells and other voltage sources.

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Micro Ohmmeter

HTHL-100B / 382

Wuhan Huatian Electric Power Automation Co., Ltd.

HTHL-100B / 382 - Wuhan Huatian Electric Power Automation Co., Ltd.

Special equipment for field high voltage switch maintenance and high voltage switch circuit resistance test in power supply department.

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WINDING COIL TURNS TESTER

VE201R

Vasavi Electronics

VE201R - Vasavi Electronics

Winding Turns Tester for Counting Measuring Number of Turns for Air Core Coils, Bobbin Coils or Solenoid Coils. Can Measure : Turns along with Winding Polarity and DC Resistance.Turns Measurement : 1 Turns to 80,000 Turns

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Winding Resistance Meter

TRM 50+

Scope T&M Pvt, Ltd.

TRM 50+ - Scope T&M Pvt, Ltd.

SCOPE introduces 50 A state of the art precision winding resistance meter, specially designed for field testing as well as factory testing of large transformers up to 500 MVA. Winding resistance value of transformer and rotating machine are directly displayed on 5.7” TFT display. TRM 50 is designed to work in live EHV switchyard conditions, ensuring operator’s safety and repeatability of results. Maintenance time saving is ensured by one time connection to transformer with simultaneous resistanc...
SCOPE introduces 50 A state of the art precision winding resistance meter, specially designed for field testing as well as factory testing of large transformers up to 500 MVA. Winding resistance value of transformer and rotating machine are directly displayed on 5.7” TFT display. TRM 50 is designed to work in live EHV switchyard conditions, ensuring operator’s safety and repeatability of results. Maintenance time saving is ensured by one time connection to transformer with simultaneous resistance measurement of three / six windings, measurement of resistances of all taps with automated tap change and demagnetization facility. The meter is protected against the back-EMF offered by large inductive windings.
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Compliance Voltage Ohmmeter

ΩhmRanger-LCV

AltoNovus Ltd

ΩhmRanger-LCV - AltoNovus Ltd

ΩhmRanger-LCV is an accurate, 3.5 Digit, Low Compliance Voltage Ohmmeter. It is able to measure from >100M to 10 Ohms, ΩhmRanger-LCV is suitable for professionals and enthusiasts alike.

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Micro Ohmmeter

HTHL-100A / 380

Wuhan Huatian Electric Power Automation Co., Ltd.

HTHL-100A / 380 - Wuhan Huatian Electric Power Automation Co., Ltd.

Special instrument for circuit resistance measurement.

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Direct Winding Transformer Monitors

Qualitrol

Qualitrol

Real time comparison of calculated and direct winding temperatures

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Micro Ohmmeter

HTHL-200A / 381

Wuhan Huatian Electric Power Automation Co., Ltd.

HTHL-200A / 381 - Wuhan Huatian Electric Power Automation Co., Ltd.

Special instrument for circuit resistance measurement.

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Transformer Winding Resistance Meters

Vanguard Instruments Company, Inc.

Vanguard Instruments Company, Inc.

The TRM-40 is Vanguard Instruments’ third generation transformer winding resistance meter. The TRM-40 is designed specifically to measure DC resistance values of transformer windings, rotating machine windings, or any dc resistance of an inductive device.

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Bobbin Winding Coil Turn Tester

SS108 Series

Sanshine Electronis Co., Ltd.

SS108 Series - Sanshine Electronis Co., Ltd.

This (SS108** series) winding coil turn testers are used for testing turn of various coils without core, like as: generator winding, transformer winding, relay, inductor, contactor, ignition coil, voice coil, etc.

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Digital Micro Ohmmeters

T&R Test Equipment Ltd.

T&R Test Equipment Ltd.

Our micro-processor controlled range of units offers the testing capability of up to 600 amps DC with 0.1μΩ resolution. Auto-ranging metering simultaneously displays all three parameters (mV, A, and μΩ).

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